Eachtra a chuireann síos ar an mbleachtaire Agatán Sacs is iad ag éalú ó phríosún i mBroisnia. Níl ach duine amháin in ann teacht i gcabhair air, an Príomh-Chigire Lispington ó Chlós na hAlban.

Ach, eatarthu, an bhfuil siad in ann an lámh in uachtar a fháil ar Bhuíon na mBuamaí Ciúine? Ní bheidh sé éasca!

Only one person can come to his aid, Chief Inspector Lispington from the Scottish Yard.
But, between them, are they able to get the upper hand on the Silent Bomb Squad?
It will not be easy!