The mysteriously low CMB power on the largest scales might point to a Universe which consists of a multi-connected space .
In addition to a suppression of large-scale power , a multi-connected space can be revealed by its circles-in-the-sky signature .
In this paper , a detailed search for this signature is carried out for those three homogeneous multi-connected spherical space forms that lead to the smallest large-scale power .
A simultaneous search for all occurring paired circles is made using filtered CMB sky maps which enhance the ordinary Sachs-Wolfe contribution .
A marginal hint is found for the right-handed Poincaré dodecahedron at \Omega _ { \hbox { \scriptsize tot } } \simeq 1.015 and for the right-handed binary tetrahedral space at \Omega _ { \hbox { \scriptsize tot } } \simeq 1.068 .
However , due to the complicated noise and foreground structure of the available microwave sky maps , we can not draw firm conclusions from our findings .